In
any
solar
system,
planets
move
in
orbits
around
a
star,
bound
to
it
by
gravitation.
Orbital
paths
are
elliptical
in
shape.
Users
can
explore
concepts
such
as
gravitational
force,
the
properties
of
ellipses,
Newton's
principles
of
mechanics,
Kepler's
laws,
orbital
acceleration,
and
tidal
effects.
This
is
part
of
the
NASA
Jet
Propulsion
Laboratory's
Basics
of
Space
Flight
training
module.
A
glossary,
...
Full description.